i tried to buy a licence for my synology but after the paypal page, i got an error. I received a paypal mail to validate my purchase but nothing since. I opened a ticket to paddle,

Not sure. Can you provide screenshots of what you see? That being said, payment processing is entirely done by Paddle, so probably not much I can do to solve PayPal / Paddle issues, though I'm curious what the error / validation email says.

Hello! I installed the FileBot Node 0.2.8 and FileBot 4.8.2 from the Synology Package Center, got myself a shiny new license file, installed, seemingly activated, but my "Execute" button is greyed out and I am getting an error when I run "System Info".

Although you now supporting lots of platforms again is great, as someone who recently purchased the Windows Store version for $20, I can't help but have somewhat mixed feelings.
If I was only a Windows user, this would be a non-issue, since you decided to keep supporting the Store version at no additional cost.

Let me first say I have no problems at all with the $6/yr price point, which I think is fair, because it leaves you probably south of $5/customer/yr after taxes, fees and whatnot, which is very fair for the amount of effort you put into this software.

However since I use FileBot on both Windows and Synology, the situation becomes somewhat different for me. Since I would very much like to continue using your updated software, I would obviously purchase a license.
However, since this license also includes a Windows version of the software, my previous purchase, a little over half a year ago (2 jan '18), is now basically useless from my point of view, other than of course providing monetary support to a passionate dev who did provide me with great support during that time.

Now I understand that from your point of view this is obviously not entirely fair, since I did use the software during that half year, which means I certainly got value for my money. It is also still being updated, so the thing I paid for is not going away or being deprecated.
However if I look at it financially, I basically paid the equivalent of 3.3 years of license under the new system, but received the equivalent of half a year of service, since I need/want to purchase a new cross-platform license from now on.

This basically leaves me with 2 options:
Option cheapskate: Revert to the old Synology package, and just keep using that since it actually still works great for my use case. This is far from idea, but functional and the cheapest solution
Option just pay: Purchase a yearly (or lifetime if it gets released) license and hope the licensing system doesn't change yet again, while knowing that I do support you, which should make the purchase feel less bad.

Let me end this post that has become way longer than I intended by saying that this post is not so much meant as criticism, but as feedback, since that is what you requested.
I still appreciate your work, and will probably go with option just pay if I'm being honest, but I just wanted to get this off my chest.

1.
You need to fill out all the required fields in the UI, e.g. certain combo boxes must not be empty.

2.
says info shows that certain optional components are not working, which is normal on less well supported architectures. You won’t notice; depending on what you’re doing.

Oh Lord! I must have been tired, just wasn't paying attention...though I would have expected it to be naturally defaulted to something like I feel v4.7.9 was. Per your feedback, I noticed that "Action:" was blank, I changed to "move and rename" and my execute button comes alive!

Quick side question, can we use node.js v8 instead of node.js v4 with your newest release?

i tried to buy a licence for my synology but after the paypal page, i got an error. I received a paypal mail to validate my purchase but nothing since. I opened a ticket to paddle,

Not sure. Can you provide screenshots of what you see? That being said, payment processing is entirely done by Paddle, so probably not much I can do to solve PayPal / Paddle issues, though I'm curious what the error / validation email says.

I'm running the node under the Admin account with an activated license and I don't know if I'm missing something but how do I run the license as the sc-deluge user account so that I can use the Filebot plugin?

I'm running the node under the Admin account with an activated license and I don't know if I'm missing something but how do I run the license as the sc-deluge user account so that I can use the Filebot plugin?

If you log in via SSH, then you can use standard Linux tools such as sudo -H -u <user> name to run commands as a different user:viewtopic.php?f=8&t=6033